Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8815f1cdf0ad53…

MALICIOUS

PDF

167.6 KB Created: 2021-03-25 16:58:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5d31b1ff215030824f877c857ad93622 SHA-1: ceda8cc46e3689f16a4e756c02cd8bce32666e2e SHA-256: 9c8815f1cdf0ad53c869030dfa6520b9ca7c2c5ea9c46edd5cf13b3a0a98144c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'xajibur.ru', suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, appears to contain text related to the Pakistan army, likely serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xajibur.ru/123?utm_term=basic+information+about+pakistan+army PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4474457/normal_601fcdb4b427b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388814/normal_60523fbc5f793.pdfIn PDF document text
    • https://nifogagerosore.weebly.com/uploads/1/3/5/3/135300162/wasafesijev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486984/normal_5fd9079ec9a8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465908/normal_5ff0707f5ff27.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402944/normal_5ffda728e7e2e.pdfIn PDF document text
    • https://lirukasuk.weebly.com/uploads/1/3/0/7/130739032/zemegogatafub-kawirekurimo-tezipo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448100/normal_604f440a3a45f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393776/normal_60535d784d52c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375355/normal_5fd9e31fe6fc9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5c90cfa9-af55-48e2-9430-1f3580382729.filesusr.com/ugd/e2b09b_99ea4256d5134e98bae9dfbec04ece18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/693c4bd6-ef80-4cf4-8fd5-babfba41725e/tukeselefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/44e97cb9-7d74-40d7-8a2f-09008ce12fa8/lalupevabowimapa.pdfIn PDF document text
    • https://c482eaa1-e3aa-4fde-9473-53ba98cc9791.filesusr.com/ugd/94322e_a7365ce621a147c5959933557901a3a9.pdf?index=trueIn PDF document text
    • https://810dce77-56ab-4324-823a-3549757f4eab.filesusr.com/ugd/1fad07_0b32e2ea83bc4297bfb6cb62dc4a04f6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3362ad57-f472-464a-ae9a-397e3724464c/how_to_remember_pll_algorithms.pdfIn PDF document text
    • https://f07eb630-23ff-4298-a1df-d7940f1ba2dc.filesusr.com/ugd/097a5b_344b9385c946427180d853640421b53b.pdf?index=trueIn PDF document text
    • https://3c45aaf8-24f3-4cde-9773-cf44a0a970d3.filesusr.com/ugd/ae7d54_97c37d714bdf449d813fe942925d01ec.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b470fe5-7c7d-498f-8071-ad4036230fc1/76410689465.pdfIn PDF document text
    • https://ad98276a-ac00-46ad-9821-b8207365a089.filesusr.com/ugd/0182ef_07e3156162b447ba8ca5e7a2b37bf895.pdf?index=trueIn PDF document text
    • https://650c977b-0274-48a2-8498-43c0efc39f4e.filesusr.com/ugd/dbad32_2794bcaf84164941b60c2b46c6757c1c.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00026c43.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x26C43 20920 bytes
SHA-256: fa8e8f17fd28c150cc3c41345d590a1cd01a51298fa2d40adf981f965a077582
font_00_sfnt_off00022c3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x22C3A 5484 bytes
SHA-256: 8b5bf642ee3e8d5dac98b030e8370bfdb01484e5e1c64a57cb2538ded5e7cc4c
font_01_sfnt_off00023edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23EDB 13620 bytes
SHA-256: 34c269b507a971d19600307250b4d1927965c3434ea8fbf11ab684b45dc1025c